AutoCodes – Ford – P0112 Ford

P0112 Ford Code - Intake Air Temperature Sensor 1 Circuit Low Input

Quick Answer

The Intake Air Temperature (IAT) Sensor is a thermistor device in which resistance changes with temperature. Common causes include Faulty Intake Air Temperature (IAT) Sensor, Intake Air Temperature Sensor harness is open or shorted, Intake Air Temperature Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0112 Ford indicates Intake Air Temperature Sensor 1 Circuit Low Input.
Common causes: Common causes include Faulty Intake Air Temperature (IAT) Sensor, Intake Air Temperature Sensor harness is open or shorted, Intake Air Temperature Sensor circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 35,170

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 22, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P0112 Ford Description

The Intake Air Temperature (IAT) Sensor is a thermistor device in which resistance changes with temperature. The resistance of a thermistor decreases as the temperature increases, and the resistance increases as the temperature decreases. The varying resistance affects the voltage drop across the sensor pins and provides electrical signals to the Powertrain Control Module (PCM) corresponding to temperature.
Thermistor-type sensors are considered passive sensors. A passive sensor is connected to a voltage divider network so that varying the resistance of the passive sensor causes a variation in total current flow. The voltage that is dropped across a fixed resistor in a series with the sensor resistor determines the voltage signal at the PCM. This voltage signal is equal to the reference voltage minus the voltage drop across the fixed resistor.
The IAT sensor provides air temperature information to the PCM. The PCM uses the air temperature information as a correction factor in the calculation of fuel, spark, and airflow.
The IAT sensor provides a quicker temperature change response time than the Engine Coolant Temperature (ECT) or Cylinder Head Temperature (CHT) sensor.
Currently, there are 2 types of IAT sensors used, a stand-alone and an integrated type. Both types function the same, however, the integrated type is incorporated into the Mass Air Flow (MAF) Sensor, the Manifold Absolute Pressure and Temperature (MAPT) Sensor, or the Turbocharger Intake Pressure and Temperature (TCIPT) Sensor instead of being a stand-alone sensor.
This Diagnostic Trouble Code (DTC) will be set if the IAT Sensor signal is less than the self-test minimum.

OBDII Code P0112 Ford - Intake Air Temperature Sensor 1 Circuit Low Input - AutoCodes.com — P0112 Ford Code - Intake Air Temperature Sensor 1 Circuit Low Input

What does this mean?

What are the Possible Causes of the DTC P0112 Ford?

Faulty Intake Air Temperature (IAT) Sensor
Intake Air Temperature Sensor harness is open or shorted
Intake Air Temperature Sensor circuit poor electrical connection

How to Fix the DTC P0112 Ford?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0112 Ford code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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Information for Specific Ford Models

P0112 1997 Ford F150 — Intake Air Temperature Sensor Circuit Low Input
P0112 1998 Ford F150 — Intake Air Temperature Sensor Circuit Low Input
P0112 1999 Ford F150 — Intake Air Temperature Sensor Circuit Low Input
P0112 2000 Ford F150 — Intake Air Temperature Sensor Circuit Low Input
P0112 2001 Ford F150 — Intake Air Temperature Sensor Circuit Low Input
P0112 2002 Ford F150 — Intake Air Temperature Sensor Circuit Low Input
P0112 2003 Ford F150 — Intake Air Temperature Sensor Circuit Low Input
P0112 2006 Ford F150 — Intake Air Temperature Sensor Circuit Low Input
P0112 2015 Ford F150 — Intake Air Temperature Sensor 1 Circuit Low Input
P0112 2016 Ford F150 — Intake Air Temperature Sensor 1 Circuit Low Input
P0112 2017 Ford F150 — Intake Air Temperature Sensor 1 Circuit Low Input
P0112 2018 Ford F150 — Intake Air Temperature Sensor 1 Circuit Low Input
P0112 2019 Ford F150 — Intake Air Temperature Sensor 1 Circuit Low Input
P0112 2020 Ford F150 — Intake Air Temperature Sensor 1 Circuit Low Input
P0112 2007 Ford Fusion — Intake Air Temperature Sensor Circuit Low Input
P0112 2008 Ford Fusion — Intake Air Temperature Sensor Circuit Low Input
P0112 2009 Ford Fusion — Intake Air Temperature Sensor Circuit Low Input
P0112 2010 Ford Fusion — Intake Air Temperature Sensor Circuit Low Input
P0112 2011 Ford Fusion — Intake Air Temperature Sensor Circuit Low Input
P0112 2012 Ford Fusion — Intake Air Temperature Sensor Circuit Low Input

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.